File Management - IBM

spooled files, refer to the Work Management book. To control the storage used on
your system see “Spooling library” on page 167.
Command examples for additional spooling support
Input spooling
You can define some functions to provide additional spooling support. Example
source and documentation for the commands, files, and programs for these
functions are part of library QUSRTOOL, which is an optionally installed part of
the OS/400 program.
Input spooling takes the information from the input device, prepares the job for
scheduling, and places an entry in a job queue. Using input spooling, you can
usually shorten job run time, increase the number of jobs that can be run
sequentially, and improve device throughput.
The main elements of input spooling are:
Job queue
An ordered list of batch jobs submitted to the system for running and from
which batch jobs are selected to run.
Reader
A function that takes jobs from an input device or a database file and
places them on a job queue.
When a batch job is read from an input source by a reader, the commands in the
input stream are stored in the system as requests for the job, the inline data is
spooled as inline data files, and an entry for the job is placed on a job queue. The
job information remains stored in the system where it was placed by the reader
until the job entry is selected from the job queue for processing by a subsystem.
Figure 15 shows this relationship.
Input Reader
Job Queue
Disk Storage
(job input)
Subsystem
Processing
Figure 15. Relationship of Input Spooling Elements
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Chapter 5. Working with spooled files 159